.<template>
  <div class="app-container">
    <h2 style="text-align: center" v-if="!this.$route.params&&!this.$route.params.id">发布新课程</h2>
    <h2 style="text-align: center" v-else>修改课程基本信息</h2>
    <el-steps
      :active="1"
      process-status="wait"
      align-center
      style="margin-bottom: 40px;"
    >
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" v-if="!this.$route.params&&!this.$route.params.id"/>
      <el-step title="最终发布" v-if="!this.$route.params&&!this.$route.params.id"/>
    </el-steps>
    <el-form label-width="120px">
      <el-form-item label="课程标题">
        <el-input
          v-model="courseInfo.title"
          placeholder=" 示例：机器学习项目课：从基础到搭建项目视频课程。专业名称注意大小写"
        />
      </el-form-item>

      <!-- 所属分类 -->
      <el-form-item label="课程分类">
        <!--一级分类-->
        <el-select v-model="courseInfo.subjectParentId" placeholder="一级分类" @change="subjectLevelOneChanged">
          <el-option
            v-for="one in subjectOneList"
            :key="one.id"
            :label="one.title"
            :value="one.id"
          ></el-option>
        </el-select>
        <!--二级分类-->
        <el-select v-model="courseInfo.subjectId" placeholder="二级分类">
          <el-option
            v-for="subject in subjectTwoList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"
          ></el-option>
        </el-select>
      </el-form-item>


      <!-- 课程讲师 TODO -->
      <!--课程讲师-->
      <el-form-item label="课程讲师">
        <el-select v-model="courseInfo.teacherId" placeholder="请选择">
          <el-option
            v-for="teacher in teacherLists"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"
          ></el-option>
        </el-select>
      </el-form-item>


      <el-form-item label="总课时">
        <el-input-number
          :min="0"
          v-model="courseInfo.lessonNum"
          controls-position="right"
          placeholder="请填写课程的总课时数"
        />
      </el-form-item>

      <!-- 课程简介-->
      <el-form-item label="课程简介">
        <tinymce :height="300" v-model="courseInfo.description"/>
      </el-form-item>
      <el-form-item label="课程版权">
        <el-radio-group v-model="courseInfo.isDiy">
          <el-radio :label="1">自制</el-radio>
          <el-radio :label="0">转载</el-radio>
        </el-radio-group>
        <el-input
          v-if="courseInfo.isDiy=='0'"
          v-model="courseInfo.copyright"
          placeholder="转载视频请注明来源，来源会显示在视频播放页中"
        />
      </el-form-item>


      <el-form-item label="课程封面">
        <el-upload
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
          :before-upload="beforeAvatarUpload"
          :action="BASE_API + '/eduoss/fileoss'"
          class="avatar-uploader"
        >
          <img :src="courseInfo.cover" width="300px" height="300px"/>
        </el-upload>
      </el-form-item>
      <el-form-item label="课程价格">
        <el-input-number
          :min="0"
          v-model="courseInfo.price"
          controls-position="right"
          placeholder="免费课程请设置为0元"
        />
        元
      </el-form-item>

      <el-form-item>
        <el-button
          v-if="!this.$route.params&&!this.$route.params.id"
          :disabled="saveBtnDisabled"
          type="primary"
          @click="saveOrUpdate"
        >保存并下一步</el-button>
        <el-button
          v-else
          :disabled="saveBtnDisabled"
          type="primary"
          @click="saveOrUpdate"
        >保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
  import course from '../../../api/course/course'
  import subject from '../../../api/subject/subject'
  //引入Tinymce富文本编辑器组件
  import Tinymce from '@/components/Tinymce'; //富文本组件
  export default {
    //声明组件
    components: { Tinymce },
    data() {
      return {
        saveBtnDisabled: false,
        courseInfo:
          {
            title: "",
            subjectParentId:'',//一级分类
            subjectId: "",//二级分类
            teacherId: "",
            lessonNum: 0,
            description: "",
            cover: "/static/01.png",
            price: 0,
            isDiy:'',
            copyright:'',

          },
        courseId:"",
        teacherLists:[],//封装所有的讲师
        subjectOneList:[],//一级分类
        subjectTwoList:[],//二级分类
        BASE_API:process.env.BASE_API//接口api地址
      };
    },
    created() {
      //判断路径中是否有课程id
      if(this.$route.params&&this.$route.params.id){
        this.courseId = this.$route.params.id
        //根据课程id 查询课程基本信息
        this.getCourseInfo()
      }else{
        //初始化所有讲师
        this.getListTeacher();
        this.getOneSubject();
      }


    },
    methods: {
      //获取课程信息
      getCourseInfo(){
        course.getCourseInfoById(this.courseId)
        .then(resp=>{
          //在courseInfo课程基本信息，包含一级分类id和二级分类id
          this.courseInfo = resp.data.courseInfoForm;
          //1.查询所有的分类，包含一级和二级
          subject.getSubjectList()
          .then(resp=>{
            //2获取所有一级分类
            this.subjectOneList = resp.data.list;
            for(var i=0;i<this.subjectOneList.length;i++){
              var oneSubject = this.subjectOneList[i];
              //3.把所有的一级分类数组进行遍历，比较当前courseInfo里面一级分类id和所有一级分类id
              if(this.courseInfo.subjectParentId==oneSubject.id){
                this.subjectTwoList = oneSubject.children;
                console.log(this.subjectTwoList)
              }
            }

          })
          //初始化所有讲师
          this.getListTeacher();

        })

      },
      //上传封面成功调用的方法
      handleAvatarSuccess(res,file){
          this.courseInfo.cover = res.data.url;
      },
      //上传之前调用的方法
      beforeAvatarUpload(file){
        console.log(file)
        const isJPG = file.type === "image/jpeg";
        const isLt2M = file.size / 1024 / 1024 < 2;
        if (!isJPG) {
          this.$message.error("上传头像图片只能是 JPG 格式!");
        }
        if (!isLt2M) {
          this.$message.error("上传头像图片大小不能超过 2MB!");
        }
        return isJPG && isLt2M;
      },

      //点击某个一级分类，触发change，显示对应二级分类
      subjectLevelOneChanged(value){
        for(var i = 0 ; i < this.subjectOneList.length;i++){
          var oneSubject = this.subjectOneList[i];
          if(oneSubject.id ===value){
            this.subjectTwoList = oneSubject.children;
            //把二级分类id值清空
            this.courseInfo.subjectId = '';
          }
        }
      },

      //查询所有一级分类列表
      getOneSubject(){
        subject.getSubjectList()
        .then(resp=>{
          this.subjectOneList = resp.data.list;
        })
      },

      //查询所有讲师
      getListTeacher(){
        course.getListTeacher()
        .then(resp=>{
          this.teacherLists = resp.data.items;
        })
      },
      //添加课程
      addCourse(){
        course.addCourseInfo(this.courseInfo).then(resp => {
          this.$message({
            message: "添加课程信息成功",
            type: "success",
          })
          //跳转到第二步，并带着这个课程生成的id
          this.$router.push({ path: "/course/chapter/"+resp.data.courseId });
        });
      },
      //修改课程
      updateCourse(){
        course.updateCourseInfo(this.courseInfo).then(resp => {
          this.$message({
            message: "修改课程信息成功",
            type: "success",
          })
          //跳转到第二步，并带着这个课程生成的id
          this.$router.push({ path: "/course/list/" });
        });
      },
      saveOrUpdate() {
        console.log(this.courseInfo.id)
        if(!this.courseInfo.id){
          this.addCourse();
        }else{
          this.updateCourse();
        }
      },
      },


  };
</script>
<style scoped>
  .tinymce-container {
    line-height: 29px;
  }
</style>

